Mushroom Kingdom (Super Smash Bros.)
From the Super Mario Wiki, the Mario encyclopedia
Mushroom Kingdom is a stage in Super Smash Bros. It is the only unlockable stage in the game. It is set to resemble Super Mario Bros., with brick blocks, falling platforms, Warp Pipes with Piranha Plants, POW Blocks and a scene from the original game in the background. It is unlocked by beating 1-P Mode with all of the eight default players, and then playing all of the other stages in Vs Mode. By going through a Warp Pipe, the player is placed at random at either the other Warp Pipe of the stage or above the abyss. The stage has additional basis in Super Mario Bros.: The Lost Levels, as there are red Piranha Plants that were first seen in that game, not Super Mario Bros. The castle in the background of the stage has a flag on top of it, which cannot happen in the original game.
The stage returns in Super Smash Bros. Ultimate, with a graphical overhaul, being more accurate toward the original Super Mario Bros. and having a background looking like the one present in Super Mario Maker. Notably, while the pipes are still 3-dimensional, they have black outlines and textures resembling their Super Mario Bros. sprites; additionally, the pipe above the abyss can be entered. The green Koopa Troopa in the background is now red, more accurate to its behavior.
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